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Concrete Bridge Repair

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Contractor and Engineering Resources
Case Studies
Reinforcement and Repair
of Concrete Highway

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Water infiltration is the most common cause of deterioration of highways and bridges. However, deficiencies could be the result of substandard design or construction, or the result of unforeseen or changing geologic conditions in the ground that supports the highway. Another common reason for repairs is the fact that many highways have outlived their designed life expectancy and therefore the construction materials themselves are degrading. Due to the fact that there are different causes for the degradation, the methods of repair vary.

In this case, Carbon/Kevlar Grid was used to waterproof segmental joints to control long term water infiltration into tension tendons.


Date: January 2006
Structure: Segmental Bridge I-75 connector to Sawgrass SR869, Fort Lauderdale, Florida
Contractor: Lanford Brothers, Rounokee VA. MJ construction, Tarpin Springs FL.
Engineer: Florida D.O.T. Larry Sessions. PE.
Material Used: FORTRESS Carbon/Kevlar Grid 24K 8" wide with 4020 epoxy resin
Project Scope:
Waterproof segmental joints to control long term water infiltration into tension tendons.



Solution:
Previous method was to saw cut and fill with low modulas epoxy. New method: 4020 was utilized as waterproofing membrane; carbon/kevlar grid was used to strengthen and transfer the load across the joint. After joints were waterproofed, E-Bond 526-HV epoxy overlay was used to overlay the entire bridge surface. 15,580 linear ft of carbon/kevlar was placed and cured at amibient temperatures.



Observations:
Entire project was completed in under 55 days, including 2,000 ft. of carbon/kevlar joint per day. After being open to traffic for over a month, there are no signs visual cracking in the overlay that had occurred when using saw cut method only a short time after being opened to traffic.

Fortress Stabilization Systems - 1-800-207-6204






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